But I've got a hole in my sock.

Do you feel different with your shoes off?  Calmer?  More intelligent?  I ask because a school in London has introduced a policy of everyone - pupils and teachers - taking off their shoes while on the school premises. The idea apparently comes from Finland where there is evidence that this produces better grades and better behaviour.  On the other hand, as one parent put it, not everybody is happy in "a smelly feet environment".